写自己周末都干了什么（英语过去式五句）
题目
写自己周末都干了什么（英语过去式五句）
答案
1 I visited my grandma on weekends.
2 I bought some books from bookstores.
3 I went to the movies with my friends.
4 I went shopping with my mother in the supermarket.
5 I helped my parents do some housework.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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